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Inhibitory activities on NO production and cytotoxicities of Compounds 1–5 and l-NMMA. Each value represents the mean ± the standard error (S.E.) of four determinations. Significant differences from the vehicle control (0 μM) group shown as * p < 0.05 and ** p < 0.01 in the NO inhibitory assay and # p < 0.05 and ## p < 0.01 in the cytotoxicity assay.
